Zobrazeno 1 - 10
of 247
pro vyhledávání: '"Famaey, Benoît"'
Autor:
Nagesh, Srikanth T., Freundlich, Jonathan, Famaey, Benoit, Bílek, Michal, Candlish, Graeme, Ibata, Rodrigo, Müller, Oliver
Ultra-diffuse galaxies (UDGs) in the Coma cluster have velocity dispersion profiles that are in full agreement with the predictions of Modified Newtonian Dynamics (MOND) in isolation. However, the external field effect (EFE) from the cluster seriousl
Externí odkaz:
http://arxiv.org/abs/2407.03413
Autor:
Stahl, Clément, Famaey, Benoit, Ibata, Rodrigo, Hahn, Oliver, Martinet, Nicolas, Montandon, Thomas
For the last decade, several probes have pointed to a cosmological tension between the amplitude of density fluctuations extrapolated from the cosmic microwave background within the standard cosmological model and the one encapsulated by the $S_8$ pa
Externí odkaz:
http://arxiv.org/abs/2404.03244
Publikováno v:
A&A 686, A92 (2024)
The structure and dynamics of the central bar of the Milky Way are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase-space of the MW. We
Externí odkaz:
http://arxiv.org/abs/2403.02393
It has recently been shown that local primordial non-Gaussianities (PNG) with significant amplitude ($|f_{\rm NL}| \sim 1000$), at small (Mpc) scales, can help in forming simulated galaxies with more disky baryonic kinematics than in the Gaussian cas
Externí odkaz:
http://arxiv.org/abs/2401.09614
Publikováno v:
MNRAS 2024 530 (2): 1781-1795
Modified Newtonian Dynamics (MOND), postulating a breakdown of Newtonian mechanics at low accelerations, has considerable success at explaining galaxy kinematics. However, the quadrupole of the gravitational field of the Solar System (SS) provides a
Externí odkaz:
http://arxiv.org/abs/2401.04796
Autor:
Li, Chengdong, Yuan, Zhen, Monari, Giacomo, Martin, Nicolas F., Siebert, Arnaud, Famaey, Benoit, Chiba, Rimpei, Kordopatis, Georges, Ibata, Rodrigo A., Hill, Vanessa
The most metal-poor tail of the Milky Way ([Fe/H] $\leq$ $-$2.5) contains a population of stars with very prograde planar orbits, which is puzzling in both their origin and evolution. A possible scenario is that they are shepherded by the bar from th
Externí odkaz:
http://arxiv.org/abs/2311.15270
Autor:
Yuan, Zhen, Li, Chengdong, Martin, Nicolas F., Monari, Giacomo, Famaey, Benoit, Siebert, Arnaud, Ardern-Arentsen, Anke, Sestito, Federico, Thomas, Guillaume F., Hill, Vanessa, Ibata, Rodrigo A., Kordopatis, Georges, Starkenburg, Else, Viswanathan, Akshara
The most metal-poor stars (e.g. [Fe/H] $\leq-2.5$) are the ancient fossils from the early assembly epoch of our Galaxy, very likely before the formation of the thick disc. Recent studies have shown that a non-negligible fraction of them have prograde
Externí odkaz:
http://arxiv.org/abs/2311.08464
Autor:
Banik, Indranil, Pittordis, Charalambos, Sutherland, Will, Famaey, Benoit, Ibata, Rodrigo, Mieske, Steffen, Zhao, Hongsheng
We test Milgromian dynamics (MOND) using wide binary stars (WBs) with separations of $2-30$ kAU. Locally, the WB orbital velocity in MOND should exceed the Newtonian prediction by $\approx 20\%$ at asymptotically large separations given the Galactic
Externí odkaz:
http://arxiv.org/abs/2311.03436
Autor:
Thomas, Guillaume F., Famaey, Benoit, Monari, Giacomo, Laporte, Chervin F. P., Ibata, Rodrigo, de Laverny, Patrick, Hill, Vanessa, Boily, Christian
Tidal streams of disrupted clusters are routinely detected in the halo of the Milky Way. It was recently shown that tidal streams of open clusters can now also be detected within the disc. In this work, we highlight the fact that tidal streams provid
Externí odkaz:
http://arxiv.org/abs/2309.05733
Autor:
Stahl, Clément, Dubois, Yohan, Famaey, Benoit, Hahn, Oliver, Ibata, Rodrigo, Kraljic, Katarina, Montandon, Thomas
Collisionless simulations of structure formation with significant local primordial non-Gaussianities at Mpc scales have shown that a non-Gaussian tail favouring underdensities, with a negative $f_{\rm NL}$ parameter, can significantly change the merg
Externí odkaz:
http://arxiv.org/abs/2307.03300